/Engine/Plugins/Runtime/ModelViewViewModel/Source/ModelViewViewModel/Public/View/MVVMViewClass.h
enum ESourceFlags { None = 0, TypeCreateInstance = 1 << 0, IsUserWidgetProperty = 1 << 1, IsOptional = 1 << 2, CanBeSet = 1 << 3, CanBeEvaluated = 1 << 4, }